Efficient and Secure Cross-Domain Sharing of Blockchain Electronic Medical Records Based on Edge Computing

Table 3

Problems and the solutions of existing EMRs.

Types	Problems	Solutions
Systematisms of personal EMRs	Lack of systematic EMRs for the individuals	By updating EMRs, establishing systematic personal EMRs for patients
Privacy leaks	The personal EMRs information of patients is directly shared without encryption or is intercepted or forged by malicious attackers, etc. There is a risk of privacy leakage, and the privacy of patients cannot be guaranteed	Using SE technology to search ciphertexts to avoid privacy leakage, and using blockchain technology to ensure the immutability and integrity of data
Store	For the same patient, the same EMRs from the different hospital is repeatedly stored, which makes the storage space consumption high	Delete newly added duplicate data, only mark duplicate EMRs without repetitive storage, and add new cases to the original EMRs
Data sharing	The hospitals are relatively independent and have poor interaction. The EMRs of the same patient cannot be shared between hospitals in real time, and there is a problem of data islands	Establish an alliance chain between the hospitals to realize real-time EMRs data sharing
Access control permissions	Patients are unaware of personal case sharing and have no access control authority to personal medical records. The hospital can view and share patient data at any time without the patient knowing	Only the doctors authorized by the patient can view and update the patient’s personal EMRs